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Reversal Of Cerebrovascular Anomalies In A Zebrafish Model Of Vein Of Galen Aneurysm.

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Reversal Of Cerebrovascular Anomalies In A Zebrafish Model Of Vein Of Galen Aneurysm.

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Reversal of cerebrovascular anomalies in a zebrafish model of vein of Galen aneurysm.

Edwige Martin-Valiente^1,2, Yao Du¹, Chloé Goemans¹

¹Laboratoire de Physiologie et Pharmacologie, Faculté de Médecine, Université libre de Bruxelles, Brussels, Belgium.

Nature Cardiovascular Research

|June 12, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Researchers identified that abnormal blood vessel fusion causes vein of Galen aneurysmal malformations (VGAMs). Targeting specific signaling pathways in zebrafish models restored normal vessel fusion, offering potential treatments for this neonatal condition.

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Area of Science:

Developmental biology
Genetics
Vascular biology

Background:

Congenital vascular malformations, including vein of Galen aneurysmal malformations (VGAMs), are prevalent in neonates and linked to poor outcomes.
Germline mutations in RASA1 and EPHB4 genes are associated with VGAMs, but developmental mechanisms are not fully understood.

Purpose of the Study:

To investigate the developmental mechanisms underlying VGAMs by creating zebrafish models.
To explore the role of RASA1 and EPHB4 in vascular development and malformation formation.

Main Methods:

Generation of zebrafish models lacking rasa1a and ephb4a to mimic VGAM genetic and structural features.
Analysis of blood flow regulation and endothelial cell responses in vascular development.
Pharmacological targeting of MAPK and phosphatidylinositol-3-kinase signaling pathways.

Main Results:

Zebrafish models lacking rasa1a and ephb4a replicated key features of VGAMs.
Malformation development was linked to insufficient fusion of precursor blood vessels, regulated by blood flow.
RASA1 deficiency destabilized blood flow homeostasis and impaired flow-mediated MAPK and phosphatidylinositol-3-kinase signaling.

Conclusions:

Insufficient blood vessel fusion, influenced by blood flow and endothelial cell signaling, underlies VGAM development.
Pharmacological intervention targeting MAPK and phosphatidylinositol-3-kinase pathways can restore normal vessel fusion in mutant models.
These findings suggest novel therapeutic strategies for VGAMs and related vascular remodeling disorders.